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The process of Natural Selection works in the following way.

All adaptations work on the same principle, whether  'artificially' induced or random natural events.

The following story serves to show how flora or fauna adapt to meet new circumstance. 

The Samurai Crab:

In the Battle of Dannoura around 1185 Japan, two powerful clans, the Taira and the Genji, were fighting a civil war over the succession of a seven year old emperor. The final battle between the two clans was fought off the coast of Dannoura, in the Japanese sea.

The Genji fought the Taira. The Taira warriors were outnumbered by three to one. But they understood the tides of that area very well and they had superior naval tactics.

They fought bravely. They lost ... in fact the Taira were driven into the sea and either killed or committed ritual suicide. One of the reasons they lost was that Taguchi Shigeyoshi, a Taira General, defected. And told the Genji which ship the little child emperor was on.

The sea ran red with blood, including the little emperors, who died before he knew he was born. The fallen were eaten by the Crabs, in fact, the crabs feasted and feasted. The Heike Crabs. The Samurai Crabs.

And ... From the victorious Genji arose the first Shogun !

From the day of the battle crab fisherman in this area would throw back any crab that had markings that resembled a human face as these could possibly contain the spirits of fallen warriors. They would only keep those crabs that did not appear to contain a warriors spirit. Over the years crabs with 'human face like' markings flourished because they were not being eaten, and all the others were eaten by the fisherman.

Slowly but surely the gene-pool came to be dominated by crabs with face-like markings. Until eventually the gene pool consisted of ONLY crabs with have face like markings.

So a change was bought about in the evolution of the crabs through a change in the crabs 'environment'.

As crabs without face like markings became scarce and disappeared, the fisherman started to only reject those that looked like warriors and ate the others .. or they would have starved. This refined selection led to the crabs resembling warriors to the finest degree.

Now ALL Heike crabs look like ancient Japanese warriors

This is how Natural Selection works ...

A good overview from the Wiki

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Hope this helped  .. Zac da Black

So true Zac da Black.

That's why in the far future - all boys will be naturally born 'darker' and the girls 'whiter'.
Besides the 'cultural' dominance throughout history, around the world and modern depictions: the male is always represented as 'darker' in appearance.
If both sexes are White, then the males are usually fashioned in 'darker' clothing.
Take 'marriage' for example: The Groom is Black. The Bride is White. Modern advertisement find it easier to depict a darker male with a whiter female than the other way around.
The Geisha women of Nihon cosmetically make their appearance 'whiter'.
African women bleach their skin to be 'whiter'.

Throw in the fact that the majority combination of mixed-race relationships are darker males & whiter females with a minority in reverse. Seems 'superior' Whitey males are far too busy being superior to worry about their breeding genetics being passed on.

Also, the cliche is that the male is 'physically' more dominant than the female. Such was the world covered by Darkie races, compared to the small European patch that Whities felt superior in.
Even now, Darkies dominate the world's population compared to the 'physically inferior' Whiteys.

With this is the cultural rise of the Whitey Female from the domination of the Whitey Male with such things as Female Liberation (the right to be seeded by males other than white).
While the Darkie males still keep those darkie females in their subordinated roles.
If anything, the Whitey race grows more from the Whitey women breeding (with others) than from the Whitey males doing the breeding. And with plenty of Darkie sperms going around at 10/1 on the whitey sperms - Whitey women have plenty to choose from.

As time goes on, there will be less and less Whitey males and Darky females as the Dominant combination of successful breeders take over: Black Groom, White Bride.
Afterall, the darkie female line is being 'culled' by the Darkie males anyway to guarantee their male dominant 'gene'.

Whitey males try hard to camouflage themselves as Darkie males to succeed with Whitey females by wearing 'black' clothes to feel more manly, cooler, etc. But it just doesn't cut the mustard really, if only by a small ineffectual percentage. Nothing more than 'cuttlefishing'.

As DNA eventually recognises the superior combination of breeding - it will become a common genetic occurrence with white males and dark females relegated to the 'birth defect' bucket.

So while Whitey male works like a 'slave' with his superiority ego, building a wonderful world and great inventions - it will be the spawn of the Darkie male bloodline that inherits (Cuckoo!) the future and enjoys the fruits of the gullible White Male superiority of a non-biological way.

Black Groom
White Bride.

Nice story.

It's crap, BTW.

30s on google